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Active Transport

Active Transport. Active Transport. Defined : Molecules move from a LOW to a HIGH concentration ATP energy needed to fight diffusion ATP = Adenosine Triphosphate ATP activates pumps (see animation). Contractile vacuole of a Paramecium.

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Active Transport

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  1. Active Transport

  2. Active Transport • Defined: Molecules move from a LOW to a HIGH concentration • ATP energy needed to fight diffusion • ATP = Adenosine Triphosphate • ATP activates pumps (see animation)

  3. Contractile vacuole of a Paramecium As water enters this cell by diffusion, it is immediately pumped out to prevent bursting

  4. Endocytosis • Endocytosis: Process in which the plasma membrane takes in substances (2 types) • 1) Phagocytosis: when a cell engulfs a solid particle • 2) Pinocytosis: when a cell engulfs a liquid particle • Unfortunately, viruses can also enter our cells this way

  5. Endocytosis & the lysosome The bacteria is engulfed by phagocytosis The bacteria is placed inside a lysosome are destroyed

  6. Exocytosis • Defined: Process when substances are expelled from the cell • Proteins, nutrients, and waste exit by exocytosis • Vesicle carry & release objects through the plasma membrane

  7. REview • How are active and passive transport different? • Which molecule powers active transport? • How are endo- and exocytosis similar? Different? • Which cell part controls active transport?

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